Re: Sony ECM-21 Mod
- --- "captainvideo_007" wrote:
> I've been looking for a mod to the ecm-21 for phantom power.Several decades ago I had three ECM-22 cardioids. I modified two
of them for phantom power (just some 6K81 resistors, a zener, and
But they were early electret models and they lost their charge at
least 20 years ago. What vintage is your ECM-21? Does it work?
- If the microphone schematic is as simple as the preliminary
description sounds, then perhaps the process that I used to modify
several EV PL76 microphones for phantom power would apply. It is
described on my website:
The 6k8 resistors may need to be lower value, but I doubt it, since
the original microphone ran from AA batteries. I'd start with the
zener at 5z1 too, because the ecm21 circuit might run perfectly well
with higher rail voltages, which translates to higher headroom. If
not, then adjust the zener voltage to 3v3.